P38A Hevac thinks it’s -40C

Hey there,

in the latest in a line of probably stupid questions, I’ve just had my hevac out (97 gems) for rebuilding and the zebra strip treatment (works a treat) but now I’ve it back in situ, it seems to think it’s -40c !

now I know it never gets too cosy here, even in summer, but -40 is pushing it.

clearly I’ve either broken a wire / connector or disturbed / disconnected the external temp sensor.

Anyone have any ideas for an easy solution ?
(Apart from scarf, hat gloves and a flask of something warming !)

thanks again

Bob

If it was powered on before the sensor was connected, it will jump to the lowest temp. When you plug the connector in, it will take ages to get back to actual temp

Also if the sensor circuit is open, i.e. you have broken a wire or got a dodgy connection, then it will read -40 as well.

Marshall8hp said:

Also if the sensor circuit is open, i.e. you have broken a wire or got a dodgy connection, then it will read -40 as well.

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That was my fear...

awkwardbob said:

That was my fear...

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W

Possibly a daft question, but would Nanocom be able to sense an open circuit in the external sensor circuit ?

also, in a ‘97 model, where shoukd the sensor be ? I had read somewhere it was in the LH air intake but I’ve just had rhat all out to seal for leaks and there was nothing there that resembled a sensor

It should be in the LH heater intake. If you take out the pollen filter you should see it poking into the vent.

Marshall8hp said:

It should be in the LH heater intake. If you take out the pollen filter you should see it poking into the vent.

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Ah, that’s what I thought. I’m pretty sure there’s nothing there because I was expecting to see something.

did they move
It to a different location after a certain model number ?

Bet it’s going to be a bugger to replace too !

awkwardbob said:

Ah, that’s what I thought. I’m pretty sure there’s nothing there because I was expecting to see something.

did they move
It to a different location after a certain model number ?

Bet it’s going to
be a bugger to replace too !

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sorry I was thinking of the exterior temp sensor.cannot help.So tired.

tomcat59alan said:

sorry I was thinking of the exterior temp sensor.cannot help.So tired.

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yes ! That’s what’s gone awry -unless an unholy chill has descended on Clydeside

awkwardbob said:

yes ! That’s what’s gone awry -unless an unholy chill has descended on Clydeside

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See^^^ thanks Pete.i used ,a few long extensions and a socket,think it was a 17 mm,bit of masking tape around the new one to keep it in the socket when you put it back.

tomcat59alan said:

See^^^ thanks Pete.i used ,a few long extensions and a socket,think it was a 17 mm,bit of masking tape around the new one to keep it in the socket when you put it back.

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Just found my old one,it was 17mm don't need the tape it's a tight fit on the square end.

pwood999 said:

View attachment 236427

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ah! My vin number is 38843x so that’ll be why it’s not in the air intake.

Will have a look around the condenser (which I need to replace anyway) at the weekend.

thanks

Bob

No7

Before you go pulling stuff apart, make sure to drive the car over 20 for about 15 mins. The hevac doesnt take the reading until it knows you are properly under way, until then it'll show -40

My hevac temp is bit crazy after replacing my head sensors. Starts off thinking it’s extra hot then as I drive along the temperature goes down slowly until it gives actual real temperature. One cause of this I think is that my DT should not have this type hevac to begin with and I have no idea how they got it to work in first place

RangeRoller dt said:

My hevac temp is bit crazy after replacing my head sensors. Starts off thinking it’s extra hot then as I drive along the temperature goes down slowly until it gives actual real temperature. One cause of this I think is that my DT should not have this type hevac to begin with and I have no idea how they got it to work in first place

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My DT has climate control.

Grrrrrr said:

My DT has climate control.

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But does it have cupholders

Mark Piercy said:

But does it have cupholders

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No but they're rubbish so who would want them?!